Add a dual-band ambisonic decoder

This uses a virtual B-Format buffer for mixing, and then uses a dual-band
decoder for improved positional quality. This currently only works with first-
order output since first-order input (from the AL_EXT_BFROMAT extension) would
not sound correct when fed through a second- or third-order decoder.

This also does not currently implement near-field compensation since near-field
rendering effects are not implemented.

1 files changed, 3 insertions, 0 deletions

diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 86311761..3ce95801 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -476,6 +476,9 @@ struct ALCdevice_struct
     // Stereo-to-binaural filter
     struct bs2b *Bs2b;
 
+    /* High quality Ambisonic decoder */
+    struct BFormatDec *AmbiDecoder;
+
     /* Rendering mode. */
     enum RenderMode Render_Mode;